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1

Friday, September 19th 2014, 4:08pm

Argentine Ships for 1946

Nothing much exciting next year; a replacement for the older Project 611 patrol boats, a replacement for the Guardia Class minesweepers and a modest refit for the light scout cruisers.

Quoted

Project 618A, Argentina Light Patrol Craft laid down 1946

Displacement:
175 t light; 181 t standard; 192 t normal; 200 t full load

Dimensions: Length overall / water x beam x draught
149.13 ft / 144.36 ft x 21.33 ft x 5.74 ft (normal load)
45.46 m / 44.00 m x 6.50 m x 1.75 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 13.67lbs / 6.20kg shells, 1933 Model
Quick firing gun in deck mount
on centreline forward
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on centreline, all aft, 1 raised mount - superfiring
4 - 0.51" / 13.0 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1933 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 20 lbs / 9 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2,000 shp / 1,492 Kw = 21.18 kts
Range 1,700nm at 12.00 kts
Bunker at max displacement = 19 tons

Complement:
25 - 33

Cost:
£0.107 million / $0.429 million

Distribution of weights at normal displacement:
Armament: 2 tons, 1.3 %
Armour: 3 tons, 1.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 1.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 1 tons, 0.3 %
Machinery: 50 tons, 26.0 %
Hull, fittings & equipment: 105 tons, 54.7 %
Fuel, ammunition & stores: 17 tons, 8.9 %
Miscellaneous weights: 15 tons, 7.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
353 lbs / 160 Kg = 27.5 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.6 ft / 0.2 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.10
Seaboat quality (Average = 1.00): 1.14

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.380
Length to Beam Ratio: 6.77 : 1
'Natural speed' for length: 14.47 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 44
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 13.12 ft / 4.00 m
- Forecastle (20 %): 10.50 ft / 3.20 m
- Mid (50 %): 9.35 ft / 2.85 m
- Quarterdeck (15 %): 9.35 ft / 2.85 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 9.88 ft / 3.01 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 103.6 %
- Above water (accommodation/working, high = better): 142.7 %
Waterplane Area: 1,947 Square feet or 181 Square metres
Displacement factor (Displacement / loading): 140 %
Structure weight / hull surface area: 28 lbs/sq ft or 135 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 8.28
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

1x rack for 4x DC



Quoted

Project 621 Class, Argentina Coastal Minesweeper laid down 1946

Displacement:
476 t light; 493 t standard; 571 t normal; 634 t full load

Dimensions: Length overall / water x beam x draught
216.44 ft / 213.25 ft x 27.89 ft x 8.20 ft (normal load)
65.97 m / 65.00 m x 8.50 m x 2.50 m

Armament:
1 - 3.94" / 100 mm guns in single mounts, 30.42lbs / 13.80kg shells, 1933 Model
Dual purpose gun in deck mount
on centreline forward
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
4 - 0.52" / 13.2 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1933 Model
Machine guns in deck mounts
on side ends, evenly spread, 2 raised mounts - superfiring
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.59" / 15 mm - -
3rd: 0.39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,100 shp / 820 Kw = 15.14 kts
Range 6,500nm at 12.00 kts
Bunker at max displacement = 141 tons

Complement:
57 - 75

Cost:
£0.173 million / $0.691 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.8 %
Armour: 3 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.5 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 27 tons, 4.8 %
Hull, fittings & equipment: 261 tons, 45.7 %
Fuel, ammunition & stores: 96 tons, 16.7 %
Miscellaneous weights: 180 tons, 31.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,701 lbs / 772 Kg = 55.8 x 3.9 " / 100 mm shells or 1.1 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 0.8 ft / 0.3 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.410
Length to Beam Ratio: 7.65 : 1
'Natural speed' for length: 14.60 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 25
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.04 ft / 5.50 m
- Forecastle (20 %): 16.40 ft / 5.00 m
- Mid (45 %): 16.40 ft / 5.00 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (20 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 12.93 ft / 3.94 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 57.6 %
- Above water (accommodation/working, high = better): 154.8 %
Waterplane Area: 3,683 Square feet or 342 Square metres
Displacement factor (Displacement / loading): 208 %
Structure weight / hull surface area: 35 lbs/sq ft or 170 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.82
- Longitudinal: 5.81
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Class Names: ARA Calchaqui, Capayan, Chiquillan, Chulupi, Mocovi, Morloyan



Quoted

Light Scout Cruiser, Atlantis Design Scout Cruiser laid down 1932

Displacement:
4,277 t light; 4,454 t standard; 4,944 t normal; 5,337 t full load

Dimensions: Length overall / water x beam x draught
485.91 ft / 475.00 ft x 46.00 ft x 18.00 ft (normal load)
148.11 m / 144.78 m x 14.02 m x 5.49 m

Armament:
10 - 5.12" / 130 mm guns (5x2 guns), 66.14lbs / 30.00kg shells, 1932 Model
Breech loading guns in deck mounts with hoists
on centreline ends, majority aft, 3 raised mounts - superfiring
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, all raised mounts
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (8x2 guns), 0.24lbs / 0.11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 684 lbs / 310 kg
Shells per gun, main battery: 200
12 - 23.6" / 599.44 mm above water torpedoes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.57" / 40 mm 429.99 ft / 131.06 m 8.01 ft / 2.44 m
Ends: Unarmoured
Main Belt covers 139 % of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.97" / 50 mm 0.79" / 20 mm 1.97" / 50 mm

- Armour deck: 0.79" / 20 mm, Conning tower: 3.15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 63,484 shp / 47,359 Kw = 34.00 kts
Range 6,200nm at 15.00 kts
Bunker at max displacement = 883 tons

Complement:
294 - 383

Cost:
£2.203 million / $8.813 million

Distribution of weights at normal displacement:
Armament: 87 tons, 1.8 %
Armour: 486 tons, 9.8 %
- Belts: 213 tons, 4.3 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 44 tons, 0.9 %
- Armour Deck: 209 tons, 4.2 %
- Conning Tower: 20 tons, 0.4 %
Machinery: 1,874 tons, 37.9 %
Hull, fittings & equipment: 1,760 tons, 35.6 %
Fuel, ammunition & stores: 668 tons, 13.5 %
Miscellaneous weights: 70 tons, 1.4 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,957 lbs / 1,341 Kg = 44.1 x 5.1 " / 130 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.28
Metacentric height 2.4 ft / 0.7 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.43
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.440
Length to Beam Ratio: 10.33 : 1
'Natural speed' for length: 25.00 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 42
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 29.99 ft / 9.14 m
- Forecastle (20 %): 18.21 ft / 5.55 m
- Mid (50 %): 18.21 ft / 5.55 m
- Quarterdeck (15 %): 18.21 ft / 5.55 m
- Stern: 18.21 ft / 5.55 m
- Average freeboard: 19.15 ft / 5.84 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 138.2 %
- Above water (accommodation/working, high = better): 88.4 %
Waterplane Area: 14,359 Square feet or 1,334 Square metres
Displacement factor (Displacement / loading): 99 %
Structure weight / hull surface area: 64 lbs/sq ft or 314 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.72
- Longitudinal: 2.15
- Overall: 0.80
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily

1946 Refit Notes

Replacement of twin 37mm mounts with new 1944 Model mounts
Replacement of single 20mm mounts with new twin mounts
Removal of 12.7mm machine-guns
Refurbishment of internal fittings for life extension
Replacement of LA and HA rangefinders with new HA/LA director towers

2

Saturday, February 14th 2015, 12:14pm

Another new design, a troop ship for regular operations along the Patagonian shore and for support moves of troops in wartime.

Beagle Project 717, Argentina Transport laid down 1946

Displacement:
4,109 t light; 4,235 t standard; 5,888 t normal; 7,210 t full load

Dimensions: Length overall / water x beam x draught
430.85 ft / 426.51 ft x 59.06 ft x 15.58 ft (normal load)
131.32 m / 130.00 m x 18.00 m x 4.75 m

Armament:
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 7 lbs / 3 kg
Shells per gun, main battery: 2,000

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 5,000 shp / 3,730 Kw = 15.96 kts
Range 35,000nm at 12.00 kts
Bunker at max displacement = 2,975 tons

Complement:
335 - 436

Cost:
£1.149 million / $4.595 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0.0 %
Machinery: 125 tons, 2.1 %
Hull, fittings & equipment: 1,983 tons, 33.7 %
Fuel, ammunition & stores: 1,779 tons, 30.2 %
Miscellaneous weights: 2,000 tons, 34.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19,150 lbs / 8,686 Kg = 12,391.0 x 1.5 " / 37 mm shells or 3.6 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 3.0 ft / 0.9 m
Roll period: 14.4 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.525
Length to Beam Ratio: 7.22 : 1
'Natural speed' for length: 20.65 kts
Power going to wave formation at top speed: 32 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.61 ft / 7.50 m
- Forecastle (20 %): 22.97 ft / 7.00 m
- Mid (50 %): 21.33 ft / 6.50 m
- Quarterdeck (15 %): 21.33 ft / 6.50 m
- Stern: 21.33 ft / 6.50 m
- Average freeboard: 22.03 ft / 6.72 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 45.3 %
- Above water (accommodation/working, high = better): 204.6 %
Waterplane Area: 16,581 Square feet or 1,540 Square metres
Displacement factor (Displacement / loading): 261 %
Structure weight / hull surface area: 71 lbs/sq ft or 349 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.91
- Longitudinal: 2.55
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Class Names: Bahia San Blas

Range is 10000nm at 12 kts (493 tons bunker)

Capacity Sim
1,160 tons bunkerage as low cargo
900 tons misc weight as high cargo, total cargo 2,060 tons
900 tons misc weight for 450 troops
200 tons misc weight for cranes, deck equipment, 4x LCVP and davits etc.

3

Monday, April 6th 2015, 10:48am

A revised SS report of the Patagonia refit now underway. Corrects a mistake where I had all the 152mm turrets as centreline forward!
The only other change is swapping the 37mm twins for German 55mm twins.

Patagonia, Argentina/ Italy Battlecruiser laid down 1928

Displacement:
24,882 t light; 26,088 t standard; 27,586 t normal; 28,785 t full load

Dimensions: Length overall / water x beam x draught
737.60 ft / 721.78 ft x 87.60 ft x 28.54 ft (normal load)
224.82 m / 220.00 m x 26.70 m x 8.70 m

Armament:
8 - 12.01" / 305 mm guns (4x2 guns), 996.49lbs / 452.00kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
18 - 5.98" / 152 mm guns (6x3 guns), 110.23lbs / 50.00kg shells, 1928 Model
Breech loading guns in turrets (on barbettes)
on side, evenly spread
8 - 3.94" / 100 mm guns (4x2 guns), 30.42lbs / 13.80kg shells, 1928 Model
Dual purpose guns in deck mounts
on side, all forward
16 - 2.17" / 55.0 mm guns (8x2 guns), 5.08lbs / 2.30kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 10,284 lbs / 4,665 kg
Shells per gun, main battery: 110

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.6" / 270 mm 469.16 ft / 143.00 m 11.48 ft / 3.50 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Torpedo Bulkhead:
1.18" / 30 mm 469.16 ft / 143.00 m 22.97 ft / 7.00 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.6" / 270 mm 7.09" / 180 mm 9.84" / 250 mm
2nd: 3.94" / 100 mm 1.97" / 50 mm 2.76" / 70 mm
3rd: 0.98" / 25 mm 0.59" / 15 mm -
4th: 0.59" / 15 mm 0.20" / 5 mm -
5th: 0.39" / 10 mm - -

- Armour deck: 3.66" / 93 mm, Conning tower: 2.76" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 116,000 shp / 86,536 Kw = 31.00 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 2,696 tons

Complement:
1,069 - 1,391

Cost:
£8.937 million / $35.748 million

Distribution of weights at normal displacement:
Armament: 1,148 tons, 4.2 %
Armour: 8,415 tons, 30.5 %
- Belts: 2,431 tons, 8.8 %
- Torpedo bulkhead: 471 tons, 1.7 %
- Armament: 2,395 tons, 8.7 %
- Armour Deck: 3,063 tons, 11.1 %
- Conning Tower: 54 tons, 0.2 %
Machinery: 3,611 tons, 13.1 %
Hull, fittings & equipment: 11,648 tons, 42.2 %
Fuel, ammunition & stores: 2,705 tons, 9.8 %
Miscellaneous weights: 60 tons, 0.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
41,326 lbs / 18,745 Kg = 47.7 x 12.0 " / 305 mm shells or 5.4 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 4.5 ft / 1.4 m
Roll period: 17.3 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.92
Seaboat quality (Average = 1.00): 1.20

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.535
Length to Beam Ratio: 8.24 : 1
'Natural speed' for length: 31.01 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 34.45 ft / 10.50 m
- Forecastle (20 %): 27.89 ft / 8.50 m
- Mid (70 %): 27.89 ft / 8.50 m (18.04 ft / 5.50 m aft of break)
- Quarterdeck (15 %): 18.04 ft / 5.50 m
- Stern: 18.04 ft / 5.50 m
- Average freeboard: 25.46 ft / 7.76 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.2 %
- Above water (accommodation/working, high = better): 206.7 %
Waterplane Area: 45,283 Square feet or 4,207 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 173 lbs/sq ft or 844 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.54
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Note: Deck armour weight simulates the following; 25mm forwards, 90mm over machinery, 120mm over magazines, 90mm over steering gear

Refit Changes
New shields to 100mm gun mounts
New twin 55mm mounts replacing 37mm singles on forward superstructure, quarterdeck and upper deck
Twin 20mm mounts added (2x2 on bridge structure, 2x2 near mainmast and 1x2 each on B and X turret)
One Surface Search and one Gunnery Radio-Location set added
Four new model secondary directors fitted
New catapult fitted (one catapult removed to save weight)

4

Monday, April 6th 2015, 5:30pm

Ok, so most folks might think me mad for buying the Presidente Aguinaldo, but she's an almost sister to Patagonia.
As Bruce knows, Argentina has been hunting for a third battlecruiser to replace the old US-built battleships Libertad and Capitan Gascon. An improved de Mayo Class ship has been proposed for 1947+ but it is expensive. This ship might fill that need, generally the Navy is changing its strategy somewhat, it sees long-range oceanic commerce raiding and escort attacking forces as the way to win a repeat SA War. Coastal areas are too teeming with aircraft and smaller units to survive for long.

This is a proposed rebuild, the old sim was too tight to get adjust shell weights etc. so I decided to replace the engines to free up enough to fit a thoroughly modern German-sourced DP and AA battery. The 320mm guns Perdy had are puny with 453kg shells (far below the historical 1,157lb shells the OTL rebored guns had) so I'm relining them to fire the standard Italian 305mm 452kg shells used by Patagonia. The SS report remains the same as the gun weight etc. should be the same.
I've 0.2 hull strength left to play with, I had toyed with fitting a 50mm upper belt but that's out now (0.4 hull strength required) and the armour is not too bad (deck same as the de Mayos). So I'm open to ideas etc.

Pampas? , Philippines Battlecruiser laid down 1938 (Engine 1947)

Displacement:
25,091 t light; 26,377 t standard; 28,277 t normal; 29,796 t full load

Dimensions: Length overall / water x beam x draught
752.63 ft / 750.00 ft x 80.00 ft (Bulges 91.20 ft) x 26.50 ft (normal load)
229.40 m / 228.60 m x 24.38 m (Bulges 27.80 m) x 8.08 m

Armament:
3 - 12.60" / 320 mm guns (1x3 guns), 996.49lbs / 452.00kg shells, 1938 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
4 - 12.60" / 320 mm guns (2x2 guns), 996.49lbs / 452.00kg shells, 1938 Model
Breech loading guns in turrets (on barbettes)
on centreline, all aft, 1 raised mount - superfiring
16 - 5.04" / 128 mm guns (8x2 guns), 63.99lbs / 29.03kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side ends, evenly spread
16 - 2.17" / 55.0 mm guns (8x2 guns), 5.08lbs / 2.30kg shells, 1945 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
16 - 0.79" / 20.0 mm guns (4x4 guns), 0.24lbs / 0.11kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 8,084 lbs / 3,667 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11.0" / 280 mm 487.50 ft / 148.59 m 13.12 ft / 4.00 m
Ends: Unarmoured
Main Belt covers 100 % of normal length

- Torpedo Bulkhead and Bulges:
1.57" / 40 mm 487.50 ft / 148.59 m 25.43 ft / 7.75 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 280 mm 7.87" / 200 mm 9.06" / 230 mm
2nd: 11.0" / 280 mm 7.87" / 200 mm 9.06" / 230 mm
3rd: 0.98" / 25 mm 0.79" / 20 mm 0.79" / 20 mm
4th: 0.59" / 15 mm 0.39" / 10 mm -
5th: 0.39" / 10 mm - -

- Armour deck: 4.72" / 120 mm, Conning tower: 11.02" / 280 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 133,000 shp / 99,218 Kw = 32.01 kts
Range 15,000nm at 12.00 kts
Bunker at max displacement = 3,420 tons

Complement:
1,089 - 1,417

Cost:
£12.462 million / $49.847 million

Distribution of weights at normal displacement:
Armament: 1,039 tons, 3.7 %
Armour: 9,245 tons, 32.7 %
- Belts: 2,958 tons, 10.5 %
- Torpedo bulkhead: 722 tons, 2.6 %
- Armament: 1,548 tons, 5.5 %
- Armour Deck: 3,796 tons, 13.4 %
- Conning Tower: 220 tons, 0.8 %
Machinery: 3,286 tons, 11.6 %
Hull, fittings & equipment: 11,251 tons, 39.8 %
Fuel, ammunition & stores: 3,186 tons, 11.3 %
Miscellaneous weights: 270 tons, 1.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
42,849 lbs / 19,436 Kg = 42.9 x 12.6 " / 320 mm shells or 6.7 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 4.6 ft / 1.4 m
Roll period: 17.9 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.48
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.546
Length to Beam Ratio: 8.22 : 1
'Natural speed' for length: 31.58 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.10 ft / 9.17 m
- Forecastle (20 %): 22.00 ft / 6.71 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 22.00 ft / 6.70 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 90.6 %
- Above water (accommodation/working, high = better): 161.3 %
Waterplane Area: 43,427 Square feet or 4,035 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 171 lbs/sq ft or 834 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.24
- Overall: 1.02
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent

Refit Notes
320mm guns re-lined to 305mm bore
Replacement of 115mm DP twins with 128mm automatic DP twin mounts
Replacement of 35mm quadruple mounts fitted with 55mm twin mounts
Addition of four 20mm quadruple mounts
Addition of surface-search RDF set
Addition of two gunnery fire-control RDF sets
Modernisation of fire-control equipment
Replacement of boilers and turbines
Refurbishment of internal fittings for life extension